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KMID : 1005220070220020115
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Journal of Embryo Transfer
2007 Volume.22 No. 2 p.115 ~ p.119
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Reproductive Performance of Holstein Cattle Treated with Progesterone and Combination of Progesterone and Estradiol
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Baek Kwang-Soo
Lee Wang-Sik
Son Jun-Kyu
Kim H. S.
Lee Hyung-June
Ahn Byeong-Seog
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Abstract
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This study was carried out to investigate the effects of hormones (progesterone, and combination of progesterone and estradiol) on the reproductive performance of dairy cattle. The intravaginal CIDR was inserted in the vagina of cow on day 14 post-insemination to stimulate progesterone secretion with and without estradiol. The CIDR was removed on the day of next expected estrus. The cows for control group were not treated with CIDR or hormones. Conception rate, estrus interval, estrus intensity and serum progesterone were measured. Conception rates in control, CIDR without estradiol and CIDR treated cows were 15.4, 38.9 and 60%, respectively. Estrus interval in cows treated with CIDR was 26.5 days compared with 37.1 and 48.5 days in control and CIDR without estradiol treated cows. Estrus signs were more intense in cows treated with CIDR compared with control and CIDR without estradiol treated cows. Pregnant cows treated with CIDR showed higher serum progesterone concentration than pregnant and non-pregnant cows in control group. Particularly, serum progesterone was significantly higher in CIDR treated pregnant cows compared to non-pregnant cows at days 1, 2 and 6 of gestation. It may be concluded from present results that CIDR treatment is better than CIDR without estradiol to improve conception rate in dairy cattle.
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KEYWORD
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Holstein, progesterone, estradiol, CIDR, conception rate, estrus interval
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